TEFLON(TM) 30B
Polytetrafluoro-Ethylene
CAS: 9002-84-0
Molecular Formula: (C2F4)n
TEFLON(TM) 30B - Names and Identifiers
TEFLON(TM) 30B - Physico-chemical Properties
| Molecular Formula | (C2F4)n |
| Molar Mass | 100.016 |
| Density | 2 |
| Melting Point | 327℃ |
| Boling Point | 400℃ |
| Water Solubility | Insoluble in water. Soluble in perfluoro kerosene. |
| Appearance | white powder |
| Storage Condition | Room Temprature |
| Stability | Stable - unreactive with most materials. Incompatible with molten alkali metals, fluorine and other halogens, strong oxidizing agents. |
| Sensitive | Easily absorbing moisture |
| Refractive Index | 1.35 |
| MDL | MFCD00084455 |
| Use | Can be made into rods, plates, pipes, films and various special-shaped products, used in aerospace, chemical, electronic, mechanical, pharmaceutical and other fields |
TEFLON(TM) 30B - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | R41 - Risk of serious damage to eyes |
| Safety Description | S24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 3 |
| RTECS | KX4025000 |
| HS Code | 39046100 |
TEFLON(TM) 30B - Upstream Downstream Industry
| Raw Materials | Tetrafluoroethylene Dispersing agent |
| Downstream Products | Micaceous Iron Oxide BORON PHOSPHATE Polytetrafluoroethylene products |
TEFLON(TM) 30B - Nature
Open Data Verified Data
PTFE suspension method is white, odorless, tasteless, non-toxic powder, the relative density of 2. 1~2.3, glass transition temperature of 327 deg C, thermal decomposition temperature of 415 deg C, excellent high and low temperature resistance, can be in -250~260 deg C under long-term use. Above 400 ℃, it is easy to decompose and release toxic gas. The electrical properties are excellent, and are not affected by the working environment, humidity, temperature and frequency. The arc resistance is good, but the corona resistance is poor. Good lubrication performance, with a very low coefficient of static and dynamic friction, the friction coefficient of the metal is low to 0. 07, the friction coefficient of its low to 0. Ol. The non-tackiness of the surface is more prominent, and almost all viscous substances cannot adhere to the surface. The wettability to water and many organic solutions is very poor. Excellent resistance to atmospheric aging and non-flammability. Long-term exposure to the atmosphere, the performance remains unchanged. Under normal conditions, PTFE is completely non-combustible. Excellent chemical stability. In addition to the element fluorine and molten metal sodium on its products have a certain corrosion effect, almost all strong acids, strong bases, strong oxidants and organic solvents have no effect on it, known as "plastic King. Polytetrafluoroethylene is added with different fillers, such as graphite, copper powder, molybdenum disulfide, glass fiber, carbon fiber, polyphenyl Ester, etc., and the performance of the filled product is greatly improved compared with pure polytetrafluoroethylene. In a variety of applications in the use of PTFE filler is very common, can widely meet the special requirements of the user. Different formulations of filled products have different properties, some resistance to load deformation can be increased by 5 times, thermal conductivity can be increased by 5 times, hardness increased by 10%, compression strength increased by 2~3 times, wear resistance is significantly improved, and the coefficient of linear expansion can be reduced by 30% ~ 50%.
Last Update：2024-01-02 23:10:35
TEFLON(TM) 30B - Preparation Method
Open Data Verified Data
The purified tetrafluoroethylene monomer is polymerized in an enamel or stainless steel polymerization kettle with water as a medium, ammonium persulfate as an initiator, sulfite reducing agent and hydrochloric acid as an activator. The operating pressure is 0.6 to 0. 8MPa, the operating temperature is 10~50 deg C, the reaction time is 2~3H, the polymer is obtained, and then by crushing, grinding, washing, drying, to obtain powder suspension polytetrafluoroethylene resin product.
Last Update：2022-01-01 11:09:00
TEFLON(TM) 30B - Introduction
Polytetrafluoroethylene 60% concentrated dispersion is a polytetrafluoroethylene aqueous dispersion containing non-ionic surface active stabilizer. It is a modified polytetrafluoroethylene aqueous dispersion with trace modified comonomers added during the polymerization process. Its products have excellent thermal stability, outstanding chemical inertness, excellent electrical insulation properties and low friction coefficient.
Last Update：2022-10-16 17:29:47
TEFLON(TM) 30B - Use
Open Data Verified Data
The suspension method of Polytetrafluoroethylene (domestic standard name for general molding PTFE resin) has a wide range of applications. In the chemical industry is suitable for use as chemical equipment lining; Pipe, pipe and valve lining; Pump, heat exchanger, fractionating column, bellows, sealing gasket and packing. In the machinery industry can be used as mechanical seals, piston rings, rotary bearings. The mechanical seal ring or static seal ring made of the mechanical seal ring can be formed with the ceramic ring, the high silicon iron ring or the hard alloy ring. They can also be used as secondary seals, such as O-rings and V-rings. Filled PTFE products prepared by adding glass fiber, graphite, bronze powder or molybdenum disulfide have good lubricity and wear resistance, and overcome the shortcomings of large creep. In the electrical and electronic industry can be used as wire, cable insulation, high-frequency cable, flexible cable, motor groove, high-precision capacitor, tube socket, various parts and connectors, electronic computer signal line insulation, printed circuit board, etc. In the construction industry, it is used for bridges, tunnels, steel roof trusses, large pipelines, storage tanks, even highways and displacement supporting slides. In the textile industry, it is used as an anti-adhesive roller, a reciprocating part, and a conveyor belt impregnated with polytetrafluoroethylene. It is used as a mold release agent in the food industry.
Last Update：2022-01-01 11:09:01
TEFLON(TM) 30B - Safety
Open Data Verified Data
This product should be packed in two layers of plastic bags, and then packed in hard barrels, each net content of 25kg. The product certificate is attached to each packaging barrel. This product is transported by non-hazardous materials, and should be protected from moisture, rolling and severe vibration. This product should be stored in a clean, cool, dry place, to prevent dust, moisture and other impurities mixed.
Last Update：2022-01-01 11:09:02
TEFLON(TM) 30B - Molding Process
Open Data Verified Data
polytetrafluoroethylene is a linear thermoplastic polymer from the molecular structure, but even at the temperature below the crystal transition point (327 ° C), it can only form a gel state without crystal, melt viscosity up to 1010 ~ 1011Pa.s, can not flow, it is difficult to use thermoplastic plastic processing method of molding, need to use similar to the "powder metallurgy" method-the combination of cold pressing and sintering processing method. Usually the powder resin in the mold with 20 ~ 30MPa pressure cold press molding, and then sintered at 370~380 ℃, and then cooling shape, made of different specifications of the plate, Rod, sleeve, gasket, parts, filled products and blanks, etc. The blanks are then machined into various parts, sheets and non-oriented films. The non-oriented film can also be rolled into an oriented film or wrapped and bonded to make a sandwich gasket and other products. In the polytetrafluoroethylene resin mixed with pore-forming agent (such as sodium sulfate or sodium chloride, etc.). After cold press molding and sintering, remove the pore-forming agent, that is, the preparation of porous blank or product. The porous blank can be turned into a porous film or sheet.
Last Update：2022-01-01 11:09:01
TEFLON(TM) 30B - Nature
Melting point 327°C
Boiling point 400°C
Density 2.15g/mL at 25 c
Refractive index 1.35
Solubility Solubility in water:
Morphology powder
Color white
Specific gravity 2
Water solubility Insoluble in water. Soluble in perfluoro kerosene.
Merck 14,7562
Stability Stable-unreactive with most materials. Incompatible with molten alkali metals, fluorine and other halogens, strong oxidizing agents.
| NIST chemical information | Polytetrafluoroethylene, annealed(9002-84-0) |
| (IARC) Carcinogen Classification | 3 (Vol. 19, Sup 7) 1987 |
| EPA chemical information | Polytetrafluoroethylene (9002-84-0) |
Last Update：2024-04-09 19:55:45
TEFLON(TM) 30B - Plastic king
Polytetrafluoroethylene (PTFE) is commonly known as the plastic king. A polymer compound made of tetrafluoroethylene by addition and polymerization. There are three kinds of granular, powder and dispersion. The density of the solid is 2.25g/cm3. White color, translucent, good heat resistance. The operating temperature can be between -75 ℃ and 250 ℃. The gas that can be decomposed and generated when heated to 415 ℃ is harmful to people. Except molten metal sodium and liquid fluorine, it does not react with all chemicals. In chemical production, it is used as equipment lining, fractionating tower, bellows, pump, valve, sealing gasket, etc.; in the mechanical industry, it is used as seal, piston ring, rotating bearing, etc.; in the electronic industry, it is used for electronic computer signal line insulation, cable insulation, high-frequency electronic instrument insulation, and manufacturing high-frequency cables, high-precision capacitors, wires, etc.; in the construction industry, it is used to make large; in the textile industry, it can be used as anti-stick rollers, transport belts impregnated with polytetrafluoroethylene, etc.; in the pharmaceutical industry, it can be used as artificial blood vessels, artificial cardiopulmonary devices, disinfection protectors, etc.; in the plastic and food industries, it can be used as a release agent. In 1935, when R.J. Prakite was studying the refrigerant of halothane, he found that the container was filled with tetrafluoroethylene, and white solids appeared on the wall of the container. This was the polytetrafluoroethylene originally discovered. In 1941, DuPont Company of the United States conducted a pilot test and began industrial production in 1950.
Last Update：2024-04-09 19:55:45
TEFLON(TM) 30B - Structure and characteristics
1. in PTFE, fluorine atoms replace hydrogen atoms in polyethylene. due to the larger radius of fluorine atoms (0.064nm), which is larger than the radius of hydrogen atoms (0.028nm), and the negative charges of fluorine atoms in adjacent macromolecules repel each other, the C- C chain is gradually twisted from the plane and fully extended tortuous conformation of polyethylene to the spiral conformation of PTFE, and form a tight completely "fluorinated" protective layer, which makes it have chemical stability and low cohesive energy density that other materials cannot match.
2. The bond energy of C- C bond is 372kJ/mol, and the bond energy of C- F bond is 347kJ/mol, which is the stronger among the known bond energies. Therefore, the intramolecular bonding is firm, the heat resistance is high, the long-term service temperature is -250 ℃ ~ 260 ℃, while the bond length of C- C bond is 1.54 × 10-10m, and the bond length of C, it is also the shorter of common single bonds, so the chemical properties are stable, and it is difficult to react with other substances, showing excellent weather resistance, stain resistance and chemical resistance.
3. There is no branched chain on the main chain of macromolecules, and no cross-chain is formed in the whole, so the molecular profile is smooth. In addition, the TFE monomer has perfect symmetry and makes the attraction force and surface energy between PTFE molecules low, so PTFE has extremely low surface friction coefficient, and it is easy to transfer to the dual surface during the sliding process to form a thin transfer film.
Last Update：2024-04-09 19:55:45
TEFLON(TM) 30B - Performance
1. High chemical stability
PTFE can withstand the effects of all strong acids, strong bases, strong oxidants, reducing agents, etc. except molten alkali metals, fluorine elements, strong fluorinated media and sodium hydroxide above 300 ℃. Its chemical corrosion resistance exceeds that of precious metals, glass, ceramics, enamel and alloys. Even the strong corrosive agent in the atomic energy industry, uranium fluoride does not corrode it.
2. Wide use temperature range
PTFE can be used in a wide area of -250~260 ℃, and can still maintain certain flexibility even at ultra-low temperature of -260 ℃. At 260 ℃, its breaking strength still maintains about 5MPa (about 1/5 of room temperature) and its bending strength reaches 1.4MPa.
3. Outstanding non-stickiness
PTFE is a solid material with the smallest surface energy at present. The surface tension is only 0.019N/m. Almost all solid materials cannot adhere to its surface. Only liquid with surface tension below 0.02N/m can completely infiltrate its surface.
4. abnormal lubricity
Because the mutual attraction between PTFE macromolecules is small and the surface attraction to other molecules is also very small, its friction coefficient is very small, and it is the self-lubricating material with the lowest friction coefficient found so far.
5. Excellent electrical insulation performance
PTFE is a highly non-polar material with excellent dielectric properties. Arc resistance is excellent. During high voltage discharge, only some cracked non-conductive gas is released without carbonization causing short circuit.
6. Excellent aging resistance and radiation resistance
There is no photosensitive group in PTFE molecule, so it is not only stable in size at low temperature and high temperature, but also has the same performance in harsh environment. It is not attacked by microorganisms in humid state, and has extremely high protection ability against various radiation.
7. Minimal water absorption
The water absorption rate of PTFE is generally about 0.001% ~ 0.005%, and its permeability is also low.
Last Update：2024-04-09 19:55:45
TEFLON(TM) 30B - Application
PTFE has excellent high and low temperature performance and chemical stability, good electrical insulation, non-adhesion, weather resistance, non-combustibility and good lubricity, and its application ranges from the aerospace field to a wide range of daily commodities. It has become an indispensable material for solving many key technologies in modern science and technology, military industry and civil use.
1. application in anti-corrosion and anti-wear
according to the relevant statistics of developed countries, in today's industrialized countries, the annual economic losses caused by corrosion account for about 4% of the total economic output value. A considerable number of accidents in chemical production are caused by chemical reactions caused by equipment corrosion and medium leakage. It can be seen that the damage caused by corrosion is serious and has attracted extensive attention. PTFE material overcomes the corrosion resistance of ordinary plastics, metals, graphite, ceramics, etc., and has poor flexibility. With its excellent high and low temperature resistance and corrosion resistance, it can be used under harsh conditions of temperature, pressure and medium. It has become the main corrosion-resistant material in petroleum, chemical, textile and other industries.
PTFE pipes are mainly used as conveying pipes and exhaust pipes for corrosive gases, liquids, steam or chemicals. The push pipe molded by PTFE dispersion resin is lined into the steel pipe to form a lining, or the glass fiber is wound outside the PTFE push inner pipe for reinforcement, or the PTFE push pipe can be braided and wound with steel wire to transfer the liquid medium under high pressure. As an indispensable part of hydraulic transmission, it can greatly improve the rupture strength at high temperature and has good bending fatigue.
Because the friction coefficient of PTFE material is the lowest among known solid materials, this makes PTFE filled material the most ideal material for oil-free lubrication of mechanical equipment parts. For example, equipment in industrial fields such as papermaking, textiles, and food are easily contaminated with lubricating oil, so filling PTFE materials solves this problem. In addition, experiments have proved that adding a certain amount of solid additives to engine oil can effectively save engine fuel oil by about 5%.
2. Corrosion resistant sealing material
Another major application of PTFE in chemical industry is sealing materials. Due to the good comprehensive performance of PTFE, it is incomparable to any kind of sealing material. It can be used for sealing in various harsh occasions, especially for high temperature and high corrosion resistance requirements.
PTFE raw material belt has long fiber, high strength, large plasticity and good calendering. It can be completely sealed with a small pressing force. It is convenient to operate and apply. It is more efficient when used on uneven or precise surfaces. It has good sealing performance and can improve corrosion resistance and expand its scope of use.
The sealing of sliding parts uses PTFE filler, which can obtain good corrosion resistance and stability, and it has a certain compressive resilience and small sliding resistance. PTFE sealing materials are used in a wide range of temperatures. They are currently the main substitutes for traditional asbestos gasket materials. They also have high modulus, high strength, creep resistance, fatigue resistance, and high thermal conductivity, thermal expansion coefficient and friction coefficient. Small performance, adding different fillers can expand the application range.
3. application of anti-adhesion
PTFE material has the smallest surface tension in solid materials, does not adhere to any substance, and also has the excellent characteristics of high and low temperature resistance and non-toxicity. Therefore, PTFE as a coating is commonly used as an anti-sticking lining for tableware, mainly used for non-sticking pots and microwave ovens.
In the textile industry, a large number of chemical slurries are used for yarn sizing, especially when styrene-butadiene milk, acid methyl cellulose, polyvinyl acetate and other very viscous slurries are used, serious sticky roller phenomenon will occur. At this time, it is necessary to remove the sticky scars to continue production. This not only increases the amount of labor, low production efficiency, but also affects product quality. After the PTFE sticky roller is used, the anti-sticking effect, similarly, it can also be applied to various plastic packaging and sealing machines.
4. electrical applications
PTFE's inherent low loss and dielectric constant make it an ideal insulating material for wires and cables. The reason why PTFE is used as a wire coating: it has excellent electrical properties, its volume resistivity can reach 1017 Ω, its surface resistivity is greater than 1016 Ω, and it remains unchanged under 100% relative humidity; the dielectric constant is as low as 2.0, and the dielectric loss tangent is about 2 × 10-4 and has nothing to do with the temperature frequency; it has good heat resistance, long-term use at 260 ℃, good insulation, and can reach above H level; it has strong toughness and flexibility, even as low as -90 ℃ toughness still has no effect; aging resistance, excellent weather resistance, high chemical stability; non-combustible and low smoke. The printed circuit substrate made of it has been widely used in the aerospace field, so PTFE products are especially suitable for many high-performance and challenging fields such as telecommunications, computers, testing and measurement, and national defense.
5. architectural applications
With the economic development at home and abroad, many cultural and entertainment facilities have used it as a roof material in the construction, which has long been widely used abroad. The first building using this material was built in California in the 1970s. In the past two years, it has also been used in China, such as the roof of Shanghai 80,000 Stadium, Hongkou Stadium, Oriental Pearl Tower, Beijing Olympic Bird's Nest, etc. PTFE has been used as a construction membrane material for more than 20 years of durability (now the commonly used acrylic polyurethane coating, acrylic silicone coating and silicone coating with high decoration and high weather resistance, its durability is generally 5-10 years, and the highest silicone polyester coating is only 10-15 years); Moreover, it has good self-cleaning performance, does not absorb dust and dirt, rainwater can wash away the attachments on the surface, and can reduce the cost of coating and cleaning, so it is suitable for occasions with high cleanliness requirements.
6. medical and health applications
Various polymer products are widely used in modern medical treatment, which greatly excluded and replaced the application of metals and other materials in the medical field. These products are not only used in the human body and in contact with human tissues, but also used in various equipment in the medical field. In recent years, polymer PTFE has good flexibility and biocompatibility, and is gradually becoming an important component of biological functional materials.
PTFE has low surface tension, non-hydrophilic, and good biocompatibility. It can be used for artificial blood vessels. The increase in the potential energy of the inner surface of the artificial blood vessel wall will promote the settlement and coagulation of endothelial cells. This is the surface energy of microporous PTFE products. Changes lead to obvious biological reactions in surrounding tissues. Using this performance can prevent thrombosis in the graft gap. The gastroscope forceps catheter is composed of expanded PTFE and rubber and plastic film. Because it can bend and deform at will, it has no foreign body reaction in contact with human body. It is used for immediate sampling of human stomach, taking foreign body, polyp removal, etc., and can be operated freely, So that the patient is free from unnecessary pain.
In addition, polyPTFE can be made into artificial cruciate ligaments, joints, esophagus and trachea, urethra, bile tubes, etc. It can also be used for plastic surgery, bone tissue replacement, promoting fracture healing, skin or organ transplantation, periodontal tissue regeneration, etc.
7. other applications
PTFE also has many applications, such as the use of its membrane has a porous, as a filter material can selectively permeate gas or liquid, used for gas-liquid separation, gas-gas separation and liquid-liquid separation of the filter membrane; in which the addition of conductive carbon black pressure can also make heating elements, such as the middle heating layer of the electric blanket.
Last Update：2024-04-09 19:55:45
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Raw Materials for TEFLON(TM) 30B
Downstream Products for TEFLON(TM) 30B